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Diff of /sml/trunk/HISTORY

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revision 829, Mon May 14 15:30:56 2001 UTC revision 1009, Wed Jan 9 19:44:22 2002 UTC
# Line 8  Line 8 
8  The form of an entry should be:  The form of an entry should be:
9    
10  Name:  Name:
11  Date:  Date: yyyy/mm/dd
12  Tag: <post-commit CVS tag>  Tag: <post-commit CVS tag>
13  Description:  Description:
14    ----------------------------------------------------------------------
15    Name: Lal George
16    Date: 2001/01/09 14:31:35 EST 2002
17    Tag: george-20011206-rm-native-copy
18    Description:
19    
20            Removed the native COPY and FCOPY instructions
21            from all the architectures and replaced it with the
22            explicit COPY instruction from the previous commit.
23    
24            It is now possible to simplify many of the optimizations
25            modules that manipulate copies. This has not been
26            done in this change.
27    
28    ----------------------------------------------------------------------
29    Name: Lal George
30    Date: 2001/12/06 16:50:13 EST 2001
31    Tag: george-20011206-mlrisc-instruction
32    Description:
33    
34    Changed the representation of instructions from being fully abstract
35    to being partially concrete. That is to say:
36    
37      from
38            type instruction
39    
40      to
41            type instr                              (* machine instruction *)
42    
43            datatype instruction =
44                LIVE of {regs: C.cellset, spilled: C.cellset}
45              | KILL of {regs: C.cellset, spilled: C.cellset}
46              | COPYXXX of {k: CB.cellkind, dst: CB.cell list, src: CB.cell list}
47              | ANNOTATION of {i: instruction, a: Annotations.annotation}
48              | INSTR of instr
49    
50    This makes the handling of certain special instructions that appear on
51    all architectures easier and uniform.
52    
53    LIVE and KILL say that a list of registers are live or killed at the
54    program point where they appear. No spill code is generated when an
55    element of the 'regs' field is spilled, but the register is moved to
56    the 'spilled' (which is present, more for debugging than anything else).
57    
58    LIVE replaces the (now deprecated) DEFFREG instruction on the alpha.
59    We used to generate:
60    
61            DEFFREG f1
62            f1 := f2 + f3
63            trapb
64    
65    but now generate:
66    
67            f1 := f2 + f3
68            trapb
69            LIVE {regs=[f1,f2,f3], spilled=[]}
70    
71    Furthermore, the DEFFREG (hack) required that all floating point instruction
72    use all registers mentioned in the instruction. Therefore f1 := f2 + f3,
73    defines f1 and uses [f1,f2,f3]! This hack is no longer required resulting
74    in a cleaner alpha implementation. (Hopefully, intel will not get rid of
75    this architecture).
76    
77    COPYXXX is intended to replace the parallel COPY and FCOPY  available on
78    all the architectures. This will result in further simplification of the
79    register allocator that must be aware of them for coalescing purposes, and
80    will also simplify certain aspects of the machine description that provides
81    callbacks related to parallel copies.
82    
83    ANNOTATION should be obvious, and now INSTR represents the honest to God
84    machine instruction set!
85    
86    The <arch>/instructions/<arch>Instr.sml files define certain utility
87    functions for making porting easier -- essentially converting upper case
88    to lower case. All machine instructions (of type instr) are in upper case,
89    and the lower case form generates an MLRISC instruction. For example on
90    the alpha we have:
91    
92      datatype instr =
93         LDA of {r:cell, b:cell, d:operand}
94       | ...
95    
96      val lda : {r:cell, b:cell, d:operand} -> instruction
97        ...
98    
99    where lda is just (INSTR o LDA), etc.
100    
101    ----------------------------------------------------------------------
102    Name: Matthias Blume
103    Date: 2001/11/22 21:40:00 EST
104    Tag: Release_110_37
105    Description:
106    
107    Release 110.37.  This time for real.
108    
109    ----------------------------------------------------------------------
110    Name: Matthias Blume
111    Date: 2001/11/21 16:35:00 EST
112    Tag: blume-20011121-foot-in-mouth
113    Description:
114    
115    Removed the "Release_110_37" tag because of a serious bug.
116    This will be re-tagged once the bug is fixed.
117    
118    ----------------------------------------------------------------------
119    Name: Matthias Blume
120    Date: 2001/11/21 16:14:00 EST
121    Tag: blume-20011121-forgottenfile
122    Description:
123    
124    Forgot to add a file.  (Just a .tex-file -- part of
125    the CM manual source.)
126    
127    ----------------------------------------------------------------------
128    Name: Matthias Blume
129    Date: 2001/11/21 16:10:00 EST
130    Tag: blume-20011121-invalid_110_37
131    Description:
132    
133    Note: I removed the original tag "Release_110_37" from this commit
134          because we found a serious bug in all non-x86 backends.
135          - Matthias
136    
137    1. Modifications to the SML/NJ code generator and to the runtime system
138       so that code object name strings are directly inserted into code
139       objects at code generation time.  The only business the runtime system
140       has with this is now to read the name strings on occasions.
141       (The encoding of the name string has also changed somewhat.)
142    
143    2. CM now implements a simple "set calculus" for specifying export lists.
144       In particular, it is now possible to refer to the export lists of
145       other libraries/groups/sources and form unions as well as differences.
146       See the latest CM manual for details.
147    
148    3. An separate notion of "proxy" libraries has again be eliminated from
149       CM's model.  (Proxy libraries are now simply a special case of using
150       the export list calculus.)
151    
152    4. Some of the existing libraries now take advantage of the new set
153       calculus.
154       (Notice that not all libraries have been converted because some
155       of the existing .cm-files are supposed to be backward compatible
156       with 110.0.x.)
157    
158    5. Some cleanup in stand-alone programs.  (Don't use "exnMessage" -- use
159       "General.exnMessage"!  The former relies on a certain hook to be
160       initialized, and that often does not happen in the stand-alone case.)
161    
162    ----------------------------------------------------------------------
163    Name: Lal George
164    Date: 2001/11/21  13:56:18 EST
165    Tag: george-2001121-pseudo-ops
166    Description:
167    
168      Implemented a complete redesign of MLRISC pseudo-ops. Now there
169      ought to never be any question of incompatabilities with
170      pseudo-op syntax expected by host assemblers.
171    
172      For now, only modules supporting GAS syntax are implemented
173      but more should follow, such as MASM, and vendor assembler
174      syntax, e.g. IBM as, Sun as, etc.
175    
176    ----------------------------------------------------------------------
177    Name: Matthias Blume
178    Date: 2001/11/14 11:52:00 EST
179    Tag: blume-20011114-srcname
180    Description:
181    
182    1. Routed the name of the current source file to mlriscgen where it
183       should be directly emitted into the code object.  (This last part
184       is yet to be done.)
185    
186    2. Some cleanup of the pgraph code to make it match the proposal that
187       I put out the other day.  (The proposal notwithstanding, things are
188       still in flux here.)
189    
190    ----------------------------------------------------------------------
191    Name: Lal George
192    Date: 2001/11/14 09:44:04 EST
193    Tag:
194    Description:
195    
196      Fix for a backpatching bug reported by Allen.
197    
198      Because the boundary between short and long span-dependent
199      instructions is +/- 128, there are an astounding number of
200      span-dependent instructions whose size is over estimated.
201    
202      Allen came up with the idea of letting the size of span
203      dependent instructions be non-monotonic, for a maxIter
204      number of times, after which the size must be monotonically
205      increasing.
206    
207      This table shows the number of span-dependent instructions
208      whose size was over-estimated as a function of maxIter, for the
209      file Parse/parse/ml.grm.sml:
210    
211         maxIter            # of instructions:
212            10                      687
213            20                      438
214            30                      198
215            40                        0
216    
217      In compiling the compiler, there is no significant difference in
218      compilation speed between maxIter=10 and maxIter=40. Actually,
219      my measurements showed that maxIter=40 was a tad faster than
220      maxIter=10! Also 96% of the  files in the compiler reach a fix
221      point within 13 iterations, so fixing maxIter at 40, while high,
222      is okay.
223    
224    ----------------------------------------------------------------------
225    Name: Matthias Blume
226    Date: 2001/10/31 15:25:00 EST
227    Tag: blume-20011031-pgraph
228    Description:
229    
230    CKIT:
231    * Changed the "Function" constructor of type Ast.ctype to carry optional
232      argument identifiers.
233    * Changed the return type of TypeUtil.getFunction accordingly.
234    * Type equality ignores the argument names.
235    * TypeUtil.composite tries to preserve argument names but gives up quickly
236      if there is a mismatch.
237    
238    installation script:
239    * attempts to use "curl" if available (unless "wget" is available as well)
240    
241    CM:
242    * has an experimental implementation of "portable graphs" which I will
243      soon propose as an implementation-independent library format
244    * there are also new libraries $/pgraph.cm and $/pgraph-util.cm
245    
246    NLFFI-LIB:
247    * some cleanup (all cosmetic)
248    
249    NLFFIGEN:
250    * temporarily disabled the mechanism that suppresses ML output for
251      C definitions whose identifiers start with an underscore character
252    * generate val bindings for enum constants
253    * user can request that only one style (light or heavy) is being used;
254      default is to use both (command-line arguments: -heavy and -light)
255    * fixed bug in handling of function types involving incomplete pointers
256    * generate ML entry points that take record arguments (i.e., using
257      named arguments) for C functions that have a prototype with named
258      arguments
259      (see changes to CKIT)
260    
261    ----------------------------------------------------------------------
262    Name: Allen Leung
263    Date: 2001/10/27 20:34:00 EDT
264    Tag: leunga-20011027-x86-fast-fp-call
265    Description:
266    
267       Fixed the bug described in blume-20010920-slowfp.
268    
269       The fix involves
270          1. generating FCOPYs in FSTP in ia32-svid
271          2. marking a CALL with the appropriate annotation
272    
273    ----------------------------------------------------------------------
274    Name: Matthias Blume
275    Date: 2001/10/16 11:32:00 EDT
276    Tag: blume-20011016-netbsd
277    Description:
278    
279    Underscore patch from Chris Richards (fixing problem with compiling
280    runtime system under recent NetBSD).
281    
282    ----------------------------------------------------------------------
283    Name: Allen Leung
284    Date: 2001/10/12 17:18:32 EDT 2001
285    Tag: leung-20011012-x86-printflowgraph
286    Description:
287    
288    X86RA now uses a valid (instead of dummy) PrintFlowgraph module.
289    
290    ----------------------------------------------------------------------
291    Name: Lal George
292    Date: 2001/10/11 23:51:34 EDT
293    Tag: george-20011011-too-many-instrs
294    Description:
295    
296    The representation of a program point never expected to see more
297    than 65536 instructions in a basic block!
298    
299    ----------------------------------------------------------------------
300    Name: Lal George
301    Date: 2001/10/09 09:41:37 EDT
302    Tag: george-20011008-mlrisc-labels
303    Description:
304    
305    Changed the machine description files to support printing of
306    local and global labels in assembly code, based on host assembler
307    conventions.
308    
309    ----------------------------------------------------------------------
310    Name: Matthias Blume
311    Date: 2001/09/25 15:25:00 EDT
312    Tag: blume-20010925-exninfo
313    Description:
314    
315    I provided a non-hook implementation of exnName (at the toplevel) and
316    made the "dummy" implementation of exnMessage (at the toplevel) more
317    useful: if nothing gets "hooked in", then at least you are going to
318    see the exception name and a message indicating why you don't see more.
319    
320    [For the time being, programs that need exnMessage and want to use
321    ml-build should either use General.exnMessage (strongly recommended) or
322    refer to structure General at some other point so that CM sees a
323    static dependency.]
324    
325    [Similar remarks go for "print" and "use":  If you want to use their
326    functionality in stand-alone programs generated by ml-build, then use
327    TextIO.output and Backend.Interact.useFile (from $smlnj/compiler.cm).]
328    
329    ----------------------------------------------------------------------
330    Name: Matthias Blume
331    Date: 2001/09/20 17:28:00 EDT
332    Tag: blume-20010920-slowfp
333    Description:
334    
335    Allen says that x86-fast-fp is not safe yet, so I turned it off again...
336    
337    ----------------------------------------------------------------------
338    Name: Matthias Blume
339    Date: 2001/09/20 17:20:00 EDT
340    Tag: blume-20010920-canonicalpaths
341    Description:
342    
343    0. Updated the BOOT file (something that I forgot to do earlier).
344    
345    1. Small internal change to CM so that it avoids "/../" in filenames
346       as much as possible (but only where it is safe).
347    
348    2. Changed config/_run-sml (resulting in a changed bin/.run-sml) so
349       that arguments that contain delimiters are passed through correctly.
350       This change also means that all "special" arguments of the form
351       @SMLxxx... must come first.
352    
353    3. Changed install script to put relative anchor names for tool commands
354       into pathconfig.
355    
356    ----------------------------------------------------------------------
357    Name: Matthias Blume
358    >>>>>>> 1.169
359    Date: 2001/09/18 15:35:00 EDT
360    Tag: blume-20010918-readme11036
361    Description:
362    
363    Added README files.
364    
365    ----------------------------------------------------------------------
366    Name: Matthias Blume
367    Date: 2001/09/18 11:45:00 EDT
368    Tag: Release_110_36 (retag)
369    Description:
370    
371    Fixed mistake in config/preloads. Retagged as 110.36.
372    
373    ----------------------------------------------------------------------
374    Name: Matthias Blume
375    Date: 2001/09/18 09:40:00 EDT
376    Tag: Release_110_36_orig (tag changed)
377    Description:
378    
379    New version (110.36).  New bootfiles.
380    
381    ----------------------------------------------------------------------
382    Name: Matthias Blume
383    Date: 2001/09/14 16:15:00 EDT
384    Tag: blume-20010914-x86fastfp
385    Description:
386    
387    John committed some changes that Allen made, in particular a (hopefully)
388    correctly working version of the x86-fp module.
389    
390    I changed the default setting of the Control.MLRISC.getFlag "x86-fast-fp"
391    flag to "true".  Everything seems to compile to a fixpoint ok, and
392    "mandelbrot" speeds up by about 15%.
393    
394    ----------------------------------------------------------------------
395    Name: Matthias Blume
396    Date: 2001/09/13 11:20:00 EDT
397    Tag: blume-20010913-minimal
398    Description:
399    
400    1. Stefan Monnier's patch to fix a miscompilation problem that
401       was brought to light by John Reppy's work on Moby.
402    
403    2. Implemented a minimal "structure Compiler" that contains just
404       "version" and "architecture".  The minimal version will be
405       available when the full version is not.  This is for backward-
406       compatibility with code that wants to test Compiler.version.
407    
408    ----------------------------------------------------------------------
409    Name: Matthias Blume
410    Date: 2001/08/28 14:03:00 EDT
411    Tag: blume-20010828-ml-lex
412    Description:
413    
414    Fix for bug 1581, received from Neophytos Michael.
415    
416    ----------------------------------------------------------------------
417    Name: Matthias Blume
418    Date: 2001/08/27 11:20:00 EDT
419    Tag: blume-20010827-readme11035
420    Description:
421    
422    Fleshed out the README file for 110.35.
423    
424    ----------------------------------------------------------------------
425    Name: Matthias Blume
426    Date: 2001/08/24 17:10:00 EDT
427    Tag: Release_110_35
428    Description:
429    
430    New version number (110.35).  New bootfiles.
431    
432    ----------------------------------------------------------------------
433    Name: Lal George
434    Date: 2001/08/24 13:47:18 EDT 2001
435    Tag: george-20010824-MLRISC-graphs
436    Description:
437    
438     removed clusters from MLRISC completely and replaced with graphs.
439    
440    ----------------------------------------------------------------------
441    Name: Matthias Blume
442    Date: 2001/08/23 17:50:00 EDT
443    Tag: blume-20010823-toplevel
444    Description:
445    
446    - some reorganization of the code that implements various kinds of
447      environments in the compiler (static, dynamic, symbolic, combined)
448    - re-implemented the EnvRef module so that evalStream works properly
449      (if the stream contains references to "use", "CM.make", etc.)
450    - cleaned up evalloop.sml and interact.sml (but they need more cleaning)
451    
452    ----------------------------------------------------------------------
453    Name: Matthias Blume
454    Date: 2001/08/20 15:50 EDT
455    Tag: blume20010820-slipup
456    Description:
457    
458    I forgot to commit a few files.  Here they are...
459    
460    ----------------------------------------------------------------------
461    Name: Matthias Blume
462    Date: 2001/08/20 15:35:00 EDT
463    Tag: blume-20010820-debugprof
464    Description:
465    
466    !!!! NEW BOOTFILES !!!!
467    
468    This is another round of reorganizing the compiler sources.  This
469    time the main goal was to factor out all the "instrumentation"
470    passes (for profiling and backtracing) into their own library.
471    The difficulty was to do it in such a way that it does not depend
472    on elaborate.cm but only on elabdata.cm.
473    
474    Therefore there have been further changes to both elaborate.cm and
475    elabdata.cm -- more "generic" things have been moved from the former
476    to the latter.  As a result, I was forced to split the assignment
477    of numbers indicating "primtyc"s into two portions: SML-generic and
478    SML/NJ-specific.  Since it would have been awkward to maintain,
479    I bit the bullet and actually _changed_ the mapping between these
480    numbers and primtycs.  The bottom line of this is that you need
481    a new set of bin- and bootfiles.
482    
483    I have built new bootfiles for all architectures, so doing a fresh
484    checkout and config/install.sh should be all you need.
485    
486    The newly created library's name is
487    
488        $smlnj/viscomp/debugprof.cm
489    
490    and its sources live under
491    
492        src/compiler/DebugProf
493    
494    ----------------------------------------------------------------------
495    Name: Matthias Blume
496    Date: 2001/08/15 17:15:00 EDT
497    Tag: blume-20010815-compreorg
498    Description:
499    
500    This is a first cut at reorganizing the CM libraries that make up the
501    core of the compiler.  The idea is to separate out pieces that could
502    be used independently by tools, e.g., the parser, the typechecker, etc.
503    
504    The current status is a step in this direction, but it is not quite
505    satisfactory yet.  Expect more changes in the future.
506    
507    Here is the current (new) organization...
508    
509        What used to be $smlnj/viscomp/core.cm is now divided into
510        six CM libraries:
511    
512             $smlnj/viscomp/basics.cm
513                           /parser.cm
514                           /elabdata.cm
515                           /elaborate.cm
516                           /execute.cm
517                           /core.cm
518    
519        The CM files for these libraries live under src/system/smlnj/viscomp.
520        All these libraries are proxy libraries that contain precisely
521        one CM library component.  Here are the locations of the components
522        (all within the src/compiler tree):
523    
524             Basics/basics.cm
525             Parse/parser.cm
526             ElabData/elabdata.cm
527             Elaborator/elaborate.cm
528             Execution/execute.cm
529             core.cm
530    
531         [This organization is the same that has been used already
532         for a while for the architecture-specific parts of the visible
533         compiler and for the old version of core.cm.]
534    
535         As you will notice, many source files have been moved from their
536         respective original locations to a new home in one of the above
537         subtrees.
538    
539         The division of labor between the new libraries is the following:
540    
541             basics.cm:
542                - Simple, basic definitions that pertain to many (or all) of
543                  the other libraries.
544             parser.cm:
545                - The SML parser, producing output of type Ast.dec.
546                - The type family for Ast is also defined and exported here.
547             elabdata.cm:
548                - The datatypes that describe input and output of the elaborator.
549                  This includes types, absyn, and static environments.
550             elaborator.cm:
551                - The SML/NJ type checker and elaborator.
552                  This maps an Ast.dec (with a given static environment) to
553                  an Absyn.dec (with a new static environment).
554                - This libraries implements certain modules that used to be
555                  structures as functors (to remove dependencies on FLINT).
556             execute.cm:
557                - Everything having to do with executing binary code objects.
558                - Dynamic environments.
559             core.cm:
560                - SML/NJ-specific instantiations of the elaborator and MLRISC.
561                - Top-level modules.
562                - FLINT (this should eventually become its own library)
563    
564    Notes:
565    
566    I am not 100% happy with the way I separated the elaborator (and its
567    data structures) from FLINT.  Two instances of the same problem:
568    
569        1. Data structures contain certain fields that carry FLINT-specific
570           information.  I hacked around this using exn and the property list
571           module from smlnj-lib.  But the fact that there are middle-end
572           specific fields around at all is a bit annoying.
573    
574        2. The elaborator calculates certain FLINT-related information.  I tried
575           to make this as abstract as I could using functorization, but, again,
576           the fact that the elaborator has to perform calculations on behalf
577           of the middle-end at all is not nice.
578    
579        3. Having to used exn and property lists is unfortunate because it
580           weakens type checking.  The other alternative (parameterizing
581           nearly *everything*) is not appealing, though.
582    
583    I removed the "rebinding =" warning hack because due to the new organization
584    it was awkward to maintain it.  As a result, the compiler now issues some of
585    these warnings when compiling init.cmi during bootstrap compilation. On
586    the plus side, you also get a warning when you do, for example:
587       val op = = Int32.+
588    which was not the case up to now.
589    
590    I placed "assign" and "deref" into the _Core structure so that the
591    code that deals with the "lazy" keyword can find them there.  This
592    removes the need for having access to the primitive environment
593    during elaboration.
594    
595    ----------------------------------------------------------------------
596    Name: Matthias Blume
597    Date: 2001/08/13
598    Tag: blume-20010813-closures
599    Description:
600    
601    This fix was sent to us by Zhong Shao.  It is supposed to improve the
602    performance of certain loops by avoiding needless closure allocation.
603    
604    ----------------------------------------------------------------------
605    Name: Lal George
606    Date: 2001/07/31 10:03:23 EDT 2001
607    Tag: george-20010731-x86-fmalloc
608    Description: Fixed bug in x86 calls
609    
610        There was a bug where call instructions would mysteriously
611        vanish. The call instruction had to be one that returned
612        a floating point value.
613    
614    ----------------------------------------------------------------------
615    Name: Lal George
616    Date: 2001/07/19 16:36:29 EDT 2001
617    Tag: george-20010719-simple-cells
618    Description:
619    
620    I have dramatically simplified the interface for CELLS in MLRISC.
621    
622    In summary, the cells interface is broken up into three parts:
623    
624      1. CellsBasis : CELLS_BASIS
625    
626            CellsBasis is a top level structure and common for all
627            architectures.  it contains the definitions of basic datatypes
628            and utility  functions over these types.
629    
630      2. functor Cells() : CELLS
631    
632            Cells generates an interface for CELLS that incorporates the
633            specific resources on the target architecture, such as the
634            presence of special register classes, their number and size,
635            and various useful substructures.
636    
637      3. <ARCH>CELLS
638    
639            e.g. SparcCells: SPARCCELLS
640    
641            <ARCH>CELLS usually contains additional bindings for special
642            registers  on the architecture, such as:
643    
644                    val r0 : cell           (* register zero *)
645                    val y : cell            (* Y register *)
646                    val psr : cell          (* processor status register *)
647                    ...
648    
649            The structure returned by applying the Cells functor is opened
650            in this interface.
651    
652    The main implication of all this is that the datatypes for cells is
653    split between CellsBasis and CELLS -- a fairly simple change for user
654    code.
655    
656    In the old scheme the CELLS interface had a definitional binding of
657    the form:
658    
659            signature CELLS = sig
660    
661               structure CellsBasis = CellsBasis
662    
663               ...
664    
665            end
666    
667    With all the sharing constraints that goes on in MLRISC, this old
668    design  quickly leads to errors such as:
669    
670            "structure definition spec inside of sharing ... "
671    
672    
673    and appears to require an unacceptable amount of sharing and where
674    constraint hackery.
675    
676    I think this error message (the interaction of definitional specs and
677    sharing) requires more explanation on our web page.
678    
679    ----------------------------------------------------------------------
680    Name: Matthias Blume
681    Date: 2001/07/19 15:00:00 EDT
682    Tag: blume-20010719-libreorg
683    Description:
684    
685    This update puts together a fairly extensive but straightforward change
686    to the way the libraries that implement the interactive system are
687    organized:
688    
689       The biggest change is the elimination of structure Compiler.  As a
690       replacement for this structure, there is now a CM library
691       (known as $smlnj/compiler.cm or $smlnj/compiler/current.cm)
692       that exports all the substructures of the original structure Compiler
693       directly.  So instead of saying Compiler.Foo.bar one now simply
694       says Foo.bar.  (The CM libraries actually export a collection of
695       structures that is richer than the collection of substructures of
696       structure Compiler.)
697    
698       To make the transition smooth, there is a separate library called
699       $smlnj/compiler/compiler.cm which puts together and exports the
700       original structure Compiler (or at least something very close to it).
701    
702       There are five members of the original structure Compiler
703       that are not exported directly but which instead became members
704       of a new structure Backend (described by signature BACKEND).  These are:
705       structure Profile (: PROFILE), structure Compile (: COMPILE), structure
706       Interact (: INTERACT), structure Machine (: MACHINE), and val
707       architecture (: string).
708    
709       Structure Compiler.Version has become structure CompilerVersion.
710    
711       Cross-compilers for alpha32, hppa, ppc, sparc, and x86 are provided
712       by $smlnj/compiler/<arch>.cm where <arch> is alpha32, hppa, ppc, sparc,
713       or x86, respectively.
714       Each of these exports the same frontend structures that
715       $smlnj/compiler.cm exports.  But they do not have a structure Backend
716       and instead export some structure <Arch>Backend where <Arch> is Alpha32,
717       Hppa, PPC, Sparc, or X86, respectively.
718    
719       Library $smlnj/compiler/all.cm exports the union of the exports of
720       $smlnj/compiler/<arch>.cm
721    
722       There are no structures <Arch>Compiler anymore, use
723       $smlnj/compiler/<arch>.cm instead.
724    
725       Library host-compiler-0.cm is gone.  Instead, the internal library
726       that instantiates CM is now called cm0.cm.  Selection of the host
727       compiler (backend) is no longer done here but. (Responsibility for it
728       now lies with $smlnj/compiler/current.cm.  This seems to be more
729       logical.)
730    
731       Many individual files have been moved or renamed.  Some files have
732       been split into multiple files, and some "dead" files have been deleted.
733    
734    Aside from these changes to library organization, there are also changes
735    to the way the code itself is organized:
736    
737       Structure Binfile has been re-implemented in such a way that it no
738       longer needs any knowledge of the compiler.  It exclusively deals
739       with the details of binfile layout.  It no longer invokes the
740       compiler (for the purpose of creating new prospective binfile
741       content), and it no longer has any knowledge of how to interpret
742       pickles.
743    
744       Structure Compile (: COMPILE) has been stripped down to the bare
745       essentials of compilation.  It no longer deals with linking/execution.
746       The interface has been cleaned up considerably.
747    
748       Utility routines for dealing with linking and execution have been
749       moved into their own substructures.
750    
751       (The ultimate goal of these changes is to provide a light-weight
752       binfile loader/linker (at least for, e.g., stable libraries) that
753       does not require CM or the compiler to be present.)
754    
755    CM documentation has been updated to reflect the changes to library
756    organization.
757    
758    ----------------------------------------------------------------------
759    Name: Matthias Blume
760    Date: 2001/07/10 17:30:00 EDT
761    Tag: Release_110_34
762    Description:
763    
764    Minor tweak to 110.34 (re-tagged):
765    
766      - README.html file added to CVS repository
767      - runtime compiles properly under FreeBSD 3.X and 4.X
768    
769    ----------------------------------------------------------------------
770    Name: Matthias Blume
771    Date: 2001/07/10 17:30:00 EDT
772    Tag: Release_110_34
773    Description:
774    
775    New version number (110.34). New bootfiles.
776    
777    ----------------------------------------------------------------------
778    Name: Matthias Blume
779    Date: 2001/07/09 16:00:00 EDT
780    Tag: blume-20010709-more-varargs
781    Description:
782    
783    I changed the handling of varargs in ml-nlffigen again:
784    The ellipsis ... will now simply be ignored (with an accompanying warning).
785    
786    The immediate effect is that you can actually call a varargs function
787    from ML -- but you can't actually supply any arguments beyond the ones
788    specified explicitly.  (For example, you can call printf with its format
789    string, but you cannot pass additional arguments.)
790    
791    This behavior is only marginally more useful than the one before, but
792    it has the advantage that a function or, more importantly, a function
793    type never gets dropped on the floor, thus avoiding follow-up problems with
794    other types that refer to the offending one.
795    
796    ----------------------------------------------------------------------
797    Name: Matthias Blume
798    Date: 2001/07/09 11:25:00 EDT
799    Tag: blume-20010709-varargs
800    Description:
801    
802    1. ckit-lib.cm now exports structure Error
803    2. ml-nlffigen reports occurences of "..." (i.e., varargs function types)
804       with a warning accompanied by a source location.  Moreover, it
805       merely skips the offending function or type and proceeds with the
806       rest of its work.u  As a result, one can safely feed C code containing
807       "..." to ml-nlffigen.
808    3. There are some internal improvements to CM, providing slightly
809       more general string substitutions in the tools subsystem.
810    
811    ----------------------------------------------------------------------
812    Name: Matthias Blume
813    Date: 2001/06/27 15:10:00 EDT
814    Tag: blume-20010627-concur
815    Description:
816    
817    Fixed a small bug in CM's handling of parallel compilation.
818    (You could observe the bug by Control-C-interrupting an ordinary
819    CMB.make or CM.stabilize and then attaching some compile servers.
820    The result was that all of a sudden the previously interrupted
821    compilation would continue on its own.  This was because of
822    an over-optimization: CM did not bother to clean out certain queues
823    when no servers were attached "anyway", resulting in the contents
824    of these queues to grab control when new servers did get attached.)
825    
826    There is also another minor update to the CM manual.
827    
828    ----------------------------------------------------------------------
829    Name: Matthias Blume
830    Date: 2001/06/26 16:15:00 EDT
831    Tag: blume-20010626-cmdoc
832    Description:
833    
834    Minor typo fixed in CM manual (syntax diagram for libraries).
835    
836    ----------------------------------------------------------------------
837    Name: Matthias Blume
838    Date: 2001/06/25 22:55:00 EDT
839    Tag: blume-20010625-x86pc
840    Description:
841    
842    Fixed a nasty bug in the X86 assembly code that caused signal
843    handlers to fail (crash) randomly.
844    
845    ----------------------------------------------------------------------
846    Name: Matthias Blume
847    Date: 2001/06/25 12:05:00 EDT
848    Tag: blume-20010625-nlffigen
849    Description:
850    
851    This update fixes a number of minor bugs in ml-nlffigen as reported by
852    Nick Carter <nbc@andrew.cmu.edu>.
853    
854      1. Silly but ok typedefs of the form "typedef void myvoid;" are now accepted.
855      2. Default names for generated files are now derived from the name of
856         the C file *without its directory*.  In particular, this causes generated
857         files to be placed locally even if the C file is in some system directory.
858      3. Default names for generated signatures and structures are also derived
859         from the C file name without its directory.  This avoids silly things
860         like "structure GL/GL".
861         (Other silly names are still possible because ml-nlffigen does not do
862          a thorough check of whether generated names are legal ML identifiers.
863          When in doubt, use command line arguments to force particular names.)
864    
865    ----------------------------------------------------------------------
866    Name: Matthias Blume
867    Date: 2001/06/21 12:25:00 EDT
868    Tag: blume-20010621-eXene
869    Description:
870    
871    eXene now compiles and (sort of) works again.
872    
873    The library name (for version > 110.33) is $/eXene.cm.
874    
875    I also added an new example in src/eXene/examples/nbody.  See the
876    README file there for details.
877    
878    ----------------------------------------------------------------------
879    Name: Matthias Blume
880    Date: 2001/06/20 16:40:00 EDT
881    Tag: blume-20010620-cml
882    Description:
883    
884    CML now compiles and works again.
885    
886    Libraries (for version > 110.33):
887    
888      $cml/cml.cm            Main CML library.
889      $cml/basis.cm          CML's version of $/basis.cm.
890      $cml/cml-internal.cm   Internal helper library.
891      $cml/core-cml.cm       Internal helper library.
892      $cml-lib/trace-cml.cm  Tracing facility.
893      $cml-lib/smlnj-lib.cm  CML's version of $/smlnj-lib.cm
894    
895    The installer (config/install.sh) has been taught how to properly
896    install this stuff.
897    
898    ----------------------------------------------------------------------
899    Name: Matthias Blume
900    Date: 2001/06/19 17:55:00 EDT
901    Tag: blume-20010619-instantiate
902    Description:
903    
904    This un-breaks the fix for bug 1432.
905    (The bug was originally fixed in 110.9 but I broke it again some
906    time after that.)
907    
908    ----------------------------------------------------------------------
909    Name: Matthias Blume
910    Date: 2001/06/19 17:25:00 EDT
911    Tag: blume-20010619-signals
912    Description:
913    
914    This should (hopefully) fix the long-standing signal handling bug.
915    (The runtime system was constructing a continuation record with an
916    incorrect descriptor which would cause the GC to drop data on the floor...)
917    
918    ----------------------------------------------------------------------
919    Name: Matthias Blume
920    Date: 2001/06/15 15:05:00 EDT
921    Tag: blume-20010615-moresparc
922    Description:
923    
924    Here is a short late-hour update related to Sparc c-calls:
925    
926     -- made handling of double-word arguments a bit smarter
927    
928     -- instruction selection phase tries to collapse certain clumsily
929        constructed ML-Trees; typical example:
930    
931            ADD(ty,ADD(_,e,LI d1),LI d2)  ->  ADD(ty,e,LI(d1+d2))
932    
933        This currently has no further impact on SML/NJ since mlriscGen does
934        not seem to generate such patterns in the first place, and c-calls
935        (which did generate them in the beginning) has meanwhile been fixed
936        so as to avoid them as well.
937    
938    ----------------------------------------------------------------------
939    Name: Matthias Blume
940    Date: 2001/06/15 15:05:00 EDT
941    Tag: blume-20010615-sparc
942    Description:
943    
944    The purpose of this update is to provide an implementation of NLFFI
945    on Sparc machines.
946    
947    Here are the changes in detail:
948    
949       * src/MLRISC/sparc/c-calls/sparc-c-calls.sml is a new file containing
950       the Sparc implementation of the c-calls API.
951       * The Sparc backend of SML/NJ has been modified to uniformely use %fp
952       for accessing the ML frame.  Thus, we have a real frame pointer and
953       can freely modify %sp without need for an omit-frame-ptr phase.
954       The vfp logic in src/compiler/CodeGen/* has been changed to accomodate
955       this case.
956       * ml-nlffigen has been taught to produce code for different architectures
957       and calling conventions.
958       * In a way similar to what was done in the x86 case, the Sparc
959       backend uses its own specific extension to mltree.  (For example,
960       it needs to be able to generate UNIMP instructions which are part
961       of the calling convention.)
962       * ml-nlffi-lib was reorganized to make it more modular (in particular,
963       to make it easier to plug in new machine- and os-dependent parts).
964    
965    There are some other fairly unrelated bug fixes and cleanups as well:
966    
967       * I further hacked the .cm files for MLRISC tools (like MDLGen) so
968       that they properly share their libraries with existing SML/NJ libraries.
969       * I fixed a minor cosmetic bug in CM, supressing certain spurious
970       follow-up error messages.
971       * Updates to CM/CMB documentation.
972    
973    TODO items:
974    
975       * MLRISC should use a different register as its asmTemp on the Sparc.
976         (The current %o2 is a really bad choice because it is part of the
977         calling conventions, so things might interfere in unexpected ways.)
978    
979    ----------------------------------------------------------------------
980    Name: Matthias Blume
981    Date: 2001/06/07
982    Tag: blume-20010607-calls
983    Description:
984    
985    A number of internal changes related to C calls and calling conventions:
986    
987    1. ML-Tree CALL statements now carry a "pops" field.  It indicates the
988       number of bytes popped implicitly (by the callee).  In most cases
989       this field is 0 but on x86/win32 it is some non-zero value.  This
990       is information provided for the benefit of the "omit-frameptr" pass.
991    2. The CALL instruction on the x86 carries a similar "pops" field.
992       The instruction selection phase copies its value from the ML-Tree
993       CALL statement.
994    3. On all other architectures, the instruction selection phase checks
995       whether "pops=0" and complains if not.
996    4. The c-calls implementation for x86 now accepts two calling conventions:
997       "ccall" and "stdcall".  When "ccall" is selected, the caller cleans
998       up after the call and pops is set to 0.  For "stdcall", the caller
999       does nothing, leaving the cleanup to the callee; pops is set to
1000       the number of bytes that were pushed onto the stack.
1001    5. The cproto decoder (compiler/Semant/types/cproto.sml) now can
1002       distinguish between "ccall" and "stdcall".
1003    6. The UNIMP instruction has been added to the supported Sparc instruction
1004       set. (This is needed for implementing the official C calling convention
1005       on this architecture.)
1006    7. I fixed some of the .cm files under src/MLRISC/Tools to make them
1007       work with the latest CM.
1008    
1009    ----------------------------------------------------------------------
1010    Name: Matthias Blume
1011    Date: 2001/06/05 15:10:00 EDT
1012    Tag: blume-20010605-cm-index
1013    Description:
1014    
1015    0. The "lambdasplit" parameter for class "sml" in CM has been documented.
1016    
1017    1. CM can now generate "index files".  These are human-readable files
1018       that list on a per-.cm-file basis each toplevel symbol defined or
1019       imported.  The location of the index file for
1020       <p>/<d>.cm is <p>/CM/INDEX/<d>.cm.
1021       To enable index-file generation, set CM.Control.generate_index to true
1022       or export an environment-symbol: export CM_GENERATE_INDEX=true.
1023    
1024       The CM manual has been updated accordingly.
1025    
1026    2. I made some slight modifications to the c-calls API in MLRISC.
1027    
1028         a) There is now a callback to support saving/restoring of
1029            dedicated but caller-save registers around the actual call
1030            instruction.
1031         b) One can optionally specify a comment-annotation for the
1032            call instruction.
1033    
1034    3. SML/NJ (mlriscGen.sml) uses this new API for the rawccall primop.
1035       (For example, the comment annotation shows the C prototype of
1036        the function being called.)
1037    
1038    ----------------------------------------------------------------------
1039    Name: Matthias Blume
1040    Date: 2001/06/01 13:30:00 EDT
1041    Tag: blume-20010601-nlffi-cleanup
1042    Description:
1043    
1044    This is mostly a cleanup of MLFFI stuff:
1045    
1046       - some signature files have been put into a more exposed place
1047       - the ugly 'f type parameter is gone (simplifies types tremendously!)
1048       - ml-nlffigen changed accordingly
1049       - tutorial updated
1050    
1051    Other changes:
1052    
1053       - author's affiliation in CM manual(s) updated
1054       - some more recognized keywords added to Allen's sml.sty
1055    
1056    ----------------------------------------------------------------------
1057    Name: Matthias Blume
1058    Date: 2001/05/25 15:30:00 EDT
1059    Tag: blume-20010525-iptr
1060    Description:
1061    
1062      - put the official 110.33-README (as it appears on the ftp server) under
1063        CVS
1064      - fixed a small bug related to incomplete pointer types in
1065        ml-nlffigen
1066      - small cosmetic change to the ml-nlffi-lib's "arr" type constructor
1067        (it does not need the 'f type parameter)
1068    
1069    ----------------------------------------------------------------------
1070    Name: Matthias Blume
1071    Date: 2001/05/23 14:30:00 EDT
1072    Tag: Release_110_33
1073    Description:
1074    
1075    New version number (110.33).  New bootfiles.
1076    
1077    ----------------------------------------------------------------------
1078    Name: Matthias Blume
1079    Date: 2001/05/22 18:06:00 EDT
1080    Tag: blume-20010522-targets
1081    Description:
1082    
1083    Made install.sh use file config/targets.customized if it exists, falling
1084    back to config/targets if it doesn't.  This way one can have a customized
1085    version of the targets file without touching the "real thing", thus
1086    eliminating the constant fear of accidentally checking something bogus
1087    back into the CVS repository...  (File config/targets.customized must
1088    not be added to the repository!)
1089    
1090    ----------------------------------------------------------------------
1091    Name: Matthias Blume
1092    Date: 2001/05/22 16:30:00 EDT
1093    Tag: blume-20010522-minitut
1094    Description:
1095    
1096    1. Bug fix in ml-nlffigen; now (hopefully) correctly handling
1097       struct returns.
1098    2. Added src/ml-nlffi-lib/Doc/mini-tutorial.txt.  This is some very
1099       incomplete, preliminary documentation for NLFFI.
1100    
1101  ----------------------------------------------------------------------  ----------------------------------------------------------------------
1102  Name: Matthias Blume  Name: Matthias Blume
# Line 2246  Line 3332 
3332       elaborator). There were a lot of changes during my "linkpath" trials       elaborator). There were a lot of changes during my "linkpath" trials
3333       that could have been reverted to their original state but weren't.       that could have been reverted to their original state but weren't.
3334       Please, don't be too harsh on me for messing with this code a bit more       Please, don't be too harsh on me for messing with this code a bit more
3335       than what was strictly necessary...  (I _did_ resist the tempation       than what was strictly necessary...  (I _did_ resist the temptation
3336       of doing any "global reformatting" to avoid an untimely death at       of doing any "global reformatting" to avoid an untimely death at
3337       Dave's hands. :)       Dave's hands. :)
3338    

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